C07C 4/22
Preparation of hydrocarbons from hydrocarbons containing a larger number of carbon atoms
Official title: by depolymerisation to the original monomer, e.g. dicyclopentadiene to cyclopentadiene
C07C4/22 (Preparation of hydrocarbons from hydrocarbons containing a larger number of carbon atoms) appears on 88 US grants and 100 published applications in this corpus.
Search patents in C07C- Granted patents
- 88
- Published applications
- 100
- Assignees
- 76
- Inventors
- 327
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 4 | 0 |
| 1995 | 2 | 0 |
| 1996 | 5 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 2 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 1 |
| 2002 | 2 | 0 |
| 2003 | 1 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 0 |
| 2006 | 1 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 2 |
| 2012 | 0 | 1 |
| 2013 | 1 | 2 |
| 2014 | 0 | 0 |
| 2015 | 1 | 4 |
| 2016 | 2 | 1 |
| 2017 | 1 | 5 |
| 2018 | 5 | 0 |
| 2019 | 3 | 4 |
| 2020 | 4 | 1 |
| 2021 | 2 | 5 |
| 2022 | 5 | 10 |
| 2023 | 3 | 16 |
| 2024 | 10 | 18 |
| 2025 | 8 | 16 |
| 2026 | 8 | 12 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Catalytic hydrogenolysis of a polymer25 Aug 2026US 12,715,826 B2Northwestern University
- Circular economy for plastic waste to polyethylene and base oil via refinery hydrocracking unit14 Jul 2026US 12,679,789 B2Chevron U.S.A.Inc.
- Circular economy for plastic waste to polypropylene via refinery FCC unit16 Jun 2026US 12,655,077 B2Chevron U.S.A.Inc.
- Low-temperature plastic depolymerization16 Jun 2026US 12,655,265 B2Board of Supervisors of Louisiana State University and Agricultural and Mechanical College
- Char handling section and depolymerization process associated therewith16 Jun 2026US 12,655,355 B2Basell Poliolefine Italia S.r.l.
- Processes for producing cyclic olefins from polymers and re-polymerization thereof24 Sep 2026US 2026/0286085 A1
- Depolymerization of cross-linked polyethylene17 Sep 2026US 2026/0274770 A1Basell Poliolefine Italia S.r.l.
- Recovery of styrene monomer from polystyrene27 Aug 2026US 2026/0250218 A1
- Reactor for dissolving a solid feedstock based on thermosetting materials such as used-tyre granules23 Jul 2026US 2026/0208148 A1Ifp Energies Nouvelles
- Method for manufacture of stylene monomer23 Jul 2026US 2026/0209143 A1Ps Japan Corporation
Most cited
By later US patents
- Depolymerization process82US 5,386,055 AThe University of Akron · 1995
- Recovery of styrene from waste polystyrene37US 5,672,794 ABASF SE · 1997
- Depolymerization method for resource recovery from polymeric wastes35US 5,369,215 AS-P Reclamation, Inc. · 1994
- Depolymerization method for resource recovery from polymeric wastes29US 5,264,640 AS-P Reclamation, Inc. · 1993
- Apparatus for producing fuel and carbon black from rubber tires27US 5,230,777 A1993